ADU rules in Cedar Falls, IA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Senate File 592, effective July 1, 2025, requires every Iowa city and county to allow at least one accessory dwelling unit on any lot with a single-family residence. Local governments cannot ban ADUs or impose more restrictive standards than apply to the primary house.
SF 592 amended Iowa Code Chapters 414 (city zoning) and 335 (county zoning) to mandate ADU approval statewide. ADUs may not exceed the greater of 1,000 square feet or 50% of the primary residence and must comply with the State Building Code (Chapter 103A). Cities and counties cannot impose stricter setback, height, lot size, frontage, lot coverage, density, or aesthetic standards on ADUs than on the primary home. Localities cannot add parking requirements, separate utility line requirements (with limited exceptions), or different impact fees. Owner-occupancy mandates and short-term rental bans tied to ADUs are also preempted.
Local ADU prohibitions, owner-occupancy requirements, separate impact fees, or stricter dimensional standards adopted after July 1, 2025, are unenforceable. Aggrieved property owners may seek judicial review or declaratory relief.
See how Cedar Falls's adu rules rules stack up against other locations.
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